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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e694118edf83484afb53caac5bbe422c414ded350b3aaaec1c3d6d0fc30435' 
  AND token = '3e8U2J1t/fiV+1EamyXkp3nrp4rScm3VuSblcvh9H0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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