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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc4e190a45f66a83d51a7f5db532f657bb3be88757d31e75d150860d1ef0202' 
  AND token = 'suqCOR/4Sakzlx+Jl6ITWOgZnUrucQK/SY5Ur0305xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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