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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a247d001f6f927c5cffe6d06ac4c8cab63ea564b0643501ba1c7ec5d029406e' 
  AND token = 'mqJ5sWaPYqXhjQ8TB9+Fw1kBiyhSwuX7o0/rS8ErZR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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