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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bce4461b9e5b3b76dff2f42f5cfb62aebacec45ba10b644b12371826268ac1' 
  AND token = 'rpc2cZPeMbKjkamQwjZoA00xhVH0r1rzy/nmD1LgI5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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