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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc19f09048388d2220782288ce9e08f3d7b931098e2310db25d0a1bf6c54dbd' 
  AND token = '1aSNmMhufpTsXVQFEyaBaJJD3x2VSw+LoTbwGR4Swbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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