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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e89b8229b9e950d3613d033a0b85fe0882a0d7fae10d1d5aa68699a776523d' 
  AND token = '0at6VRGPvhe+N7FvkKItpUNXOMIBxQTbLG15ixziHRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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