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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdc8cc9e5e9cfd2c3e98ba359d8c892ce3db520fdc70ce51099e643fae61735' 
  AND token = 'h9xvXo3U/TQCAEhT0Hg0IwYMDgEJ2rwBxIeMnKu8354=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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