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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7514c3b1bdb70b852c8d0626a404c2df4048bd355fe1ec2cdcc4f39ea18f99' 
  AND token = 'Xa3sW+fFEDIVOEgm5dSw4S2bBAw6dX+77u/B4Ja7yzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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