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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd77cf90d960afc69393e0253d3875aa70b267244e5c6c0e44dfd9147c7d906c' 
  AND token = '0+OGbe5SbX5pfWnmN7KyOQ/NrqskV0g14S++Di5JaVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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