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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3102f38a9ab2dd63458cdadf16436d3b5c7a4deb7cba2f6e5fb01172c97b32e4' 
  AND token = 'jks4XGWnw5C8PCY9k0Ri5OOKy3WJ35HLESc+cphN9JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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