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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cd457ae10e246f2f1287775af1496e50c408ee597018870fa8fa79daf47da8' 
  AND token = 'y3tuaB9IX/ObBBcRZAQd/iFUD29X6HzzOUORvRhD5lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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