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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984c3376ca6d54dff11974fa5e1158f97864f5456bd76aa067105a1806770749' 
  AND token = 'eR5zYI2UjZueDwr5KmHdPsE/ErUeTrgbS9pBFW+cMYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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