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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9121b4b79a0f5d72f5489e19a1d32470ba9ff2887b3a84afb6e4259728e9ec4' 
  AND token = 'nxwcaSbfsFp1qc/45rQEo64sPk1XMXP94o1cHIALDRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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