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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffd3aecbe38c2ec9074c5aed5f606151d3bf590bf8de2aca4371894e7c5fbf6' 
  AND token = 'wL5iqhEBych6h2CYWUuUv7Y5/avmVI1/PKauEtnIICA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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