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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb51dfc82246457a970a071d2ead6e4a692cd030c5b8c7b6a7c2ca7c4d469661' 
  AND token = 'YwwJoC7wn6Me3DVOXbFz+XuOFYt7ipvVg1DFXSbY5Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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