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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830e669a266244032cccbbdc9b9c01717176b18122118eeba249b6ba41e31287' 
  AND token = '5nFki3pd2x88Nc+VCEkVA7bnKp79dIL4AIU7A3GosCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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