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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdac6e914082b938c71ca10a012c7a93e468906655d79c72f4f15772bfe2478d' 
  AND token = 'I0VVZSrJojS1X5yEngNS+48t35Y2BFI91dYcBDOIj30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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