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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b2220e554140b04526b6682c14535f3739478b40a632335e536a0067e317f0' 
  AND token = 'HZ162yZ7RvX4J4rc83Bu8GoarO656eG5+B7kLVn4JTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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