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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e968a5e84044011ff2baf6813b450963a83385bcb904e208a591e3ff65ab91e6' 
  AND token = 'SzG/262IoAM0oihCDg4y7reC2ls/3dKPahOgAktFtGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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