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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3442b5147bf25ee5ce55ac83f3b1fc2ddaf57793741c2a737713bb7a16b91383' 
  AND token = 'GHWV3l2WUwzHa3XzJdGK4LDQs7A+QEwmG03WuHkURtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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