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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e990da2608783467945a8d529a185fbc1699abc40ee68a59c453cda467ccc25b' 
  AND token = 'rnedHEperNsRouPsXQHS9xS51tKIRg8kg4Qm10WL6M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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