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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9248d738c2625494f9cbc288e7ab6a9f2054f095c6009e821b02b0d493965249' 
  AND token = 'pvivzglY78oKSgv14G5s8sPjo9s4q7BGzVNb5y43Lr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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