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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb319f79cae8e951050c97aad4b0a1ed3c4d2edb25c5e7cb2eec502a20c695f0' 
  AND token = 'iHkyaiit+7Ii1Rjf/ol9RmbKXYXt5BihRL9xRXu2mm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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