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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df737d0b3ba793be52e2e5f3e47608f45f5b612ba9afa4cca9bba56daeb63f30' 
  AND token = '/su/U6U3znWUA8LEQzvn/7X9DcDVoYzOjrOxBVzr1sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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