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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7863e131756c9a45f0368a294812aab7ed8f0ab57e655fba6006c4e5f9f6c088' 
  AND token = '9SOTl5Hg5SAM5z0safiaIYC8N1dTWuiK2MEIUUynry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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