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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e102c9b7e61e4530de508c2f940c4935ae3128af9f0a9e7f7c6356f70c318dbf' 
  AND token = 'l1NBq2+7rDh045gouJqHN1sOo+CIR6nQS/NCIvQrivE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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