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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea804002a030156148e99889c8eecfd52afa9a6147ce5bb576b0cb9627765696' 
  AND token = 'STKdYt4yGQAbB/1pbDesf1DXm5O7qQ5mm3+58ODODCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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