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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9d73adb7b61d3262d4955059def481d18d4d6bf3770d8b390081260d695c39' 
  AND token = 'hBZk0mPOilk4/gXk8uf2hTOoNDWV442b7DhUz2q235o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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