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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fb142a2db143985bd3c5ace9a1662275526d924e687f199984fa027cbe1acc' 
  AND token = 'GJNNpTtHK0rymIGN03QefS0y5LSQwK7s+lQRweZMnPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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