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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1516e24100b97e5ffcb8e5fbec871dcbd7d2cb3b8bb0f7a2544e62a798f018' 
  AND token = '0Ocu1AvCaqotoBr/guK6+3m2SOJvDJJZQEnbYSY0nQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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