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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dae0275e34a174fa6f78b29296f0580a2e00d94af8d4fbb1df99173967a97ed' 
  AND token = '6KeWOfWa3I9XgOZ84kxbyaL3j/TRy0WhaWoOFVyav/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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