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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e0c4dd0e277a42df906f748b91ca8b246a9b9d118cf88dacf14ccdfd55aee1' 
  AND token = 'Wi4XvOxl5J7z44Ma2h2gBSLzSA2mHGi3gbCwyzIypxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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