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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14137b72982d29fef7c5f20332ac95eab3d287a2eb131c2a8efb44331bdb6ff' 
  AND token = 's0DagL9TjTJXHhexZTkckk81PY3e2yVNd5N9QY/0QRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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