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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d69173b95851f44bb53d7b657acbb56929deb2c45ea0fba17cee243c2c2e6c' 
  AND token = 'Z/fyMnxll2DeQP/UQAODzioM4Hua4VvMTG/nsJO163g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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