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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ac94d8e39b22c9802f998b47ef2a4c6af632a397b933e69af8ca2a3d17b6ca' 
  AND token = 'l6VFciEH5d43rNKfkdQmD4LVhnNa6A9Di4lDOqeFwPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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