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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377d38328a3e830e70b2ef2f8022e2b2d17f4e4ff4fdf6c184b313dfebe408ee' 
  AND token = 'boobuJsTRD4BC9TCayBjgROYF2qUtonr3wB0uZxugFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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