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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f939efac16ead434aca2fc400652049542c0b8615ea8814b7721b32d43fbea10' 
  AND token = '4ThkKKhpstDotx6bRK50MG1xSWZ9t154ykx+Rv2sJ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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