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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d93dc4609674a6f4ffcb1b0e3256e6f94b8792b6319df3f5bb529201e7ca60' 
  AND token = 'f/Ei83KfOIBpobnYqsbKZKx1Iy79aVgezx198IEr8to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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