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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b085c4236a1f6a79573d6dce4123eda262ba7b70d74e91f814a403f37a539d61' 
  AND token = 'Jnv/LatHGOTuyhHr1KE/Rod9Q/xTI7s0CLKx8/KFWOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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