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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efb0efaa6a35f2fad632fbbf9f9525ffe79cb3ede7bf0c22769467e1b825e70' 
  AND token = 'dR9QTJajmQD949Eib7+ptZZJ86h95FDLZe9nJlVmUNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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