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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f8073b35c5c3e5e4ab9795ad0521095bb62bfddf4506449437df6119f450a1' 
  AND token = 'wPvyh0upSj6aoh06MBitPQadT3r6n30YyrSfOdBq9Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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