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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b41102cd50403b7b5ea59a0ed6ec5782b2e601487f4fc3429b000f6ede894b' 
  AND token = '4tHhUtbjAvEuVzH2s5D6Smwn6zg23Orb1NTOjFpFnHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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