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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f873ddc86a19f3ca38b067838a1e0da3c2e7ecdfefe8d905f6db6412bdb8c8a' 
  AND token = 'b+p2DqgMqPR4CZXK4g67vrabhjKtDh01/VxqNL4SjQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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