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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b99bbf6c9694d608ff3d4f9a0043385f61a7903246a163452463b1a069e1a19' 
  AND token = 'nkgTpXTkqyGIVgic3VRSqoyunM78AKtF6p+DgpusgM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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