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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45146b3d10184fe1c9633139ac10ce6607a489fb3fc6399d95079c82a8dd1e9a' 
  AND token = 'hRpfvY5NGdI8y/alzilZBLQ4tazE0WlJOqdlqyD2Ahs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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