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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddf3d32897d002f78b3ee70667e6fed78d41c1d96e006017b3f7665d79ef7f7' 
  AND token = 'A3itGqooLs+WNTDm8ArYuJejiNSLJniicn0PE/6jhK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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