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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284dbc3b873e7513fa2c1ce4409e79e31dc24cc762ee9892e1b924cf01b660a3' 
  AND token = 'mjWxXYsJcl9vHzKAZdEEAC37o2Oz35UE18338QI16Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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