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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea1a595ced993512aa170d793e0e2c6e7021ec13c7d25c697715e645db10d1b' 
  AND token = 'i/qDX5O6zkIHfENtAlqFfnv21qJgCR9RlK9hih5ahnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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