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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0574d3cef70d7b225f96e3e4a11ef0197aa68e267f6c67c6ec3fe0ea0e5cdfa' 
  AND token = 'rZjadPNxFWqOF0D4yW3w9n51jKO3ilDZZCxG1n2oB7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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