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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee3e685a7629bacafd4bdd69cae8f2b72166dbe35acc97b3bd6ec1a8b965307' 
  AND token = '3Tlc2x/s0NrhQwg2UxkrK12FeGr3Lx0jc30kjBye1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}